Cannot download apk from mit app inventor project

Hi, everyone. Recently i want to download apk from my mit app project and after that it shows "Server error: could not build target. Please try again later!" What should I do?

Try building on Chrome or Firefox. Chrome and Firefox are the recommended browsers for App Inventor.

If that does not work, export your project and build it at

You have App Inventor open twice in the same Browser? If so, that's asking for trouble!

Ideally, App Inventor should be the 'King' of your browser so that it gets the maximum broadband width. Make sure nobody else is using up bandwidth in the house - playing games or watching movies for example.